1997 – Research Biochemicals International, Riedel-de-Haen, Techcares Systems, Carbolabs, YA Kemia.acquired to enter the chromatography market 1989 – Fluka Chemie AG (Swiss company founded in the 1950s) purchased for $39 million.Securities and Exchange Commission to hold a special investors meeting regarding approval for the sale to Merck KGaA. Novem– Sigma-Aldrich filed a definitive proxy statement with the U.S.2014 – Merck KGaA announced that it would purchase Sigma-Aldrich for approx.2005 – Announced membership in The RNAi Consortium.1999 – Sigma-Aldrich reaches $1 billion in sales.Their first year earned $43 million in sales. 1975 – Merger of Sigma Chemical and Aldrich Chemical to created Sigma-Aldrich.1972 – Subsidiary Aldrich-Boranes launched to manufacture hydroboration products.1951 – Aldrich founded in Milwaukee by Alfred Bader and Jack Eisendrath and manufactured just 1-methyl-3-nitro-1-nitrosoguanidine.They were the first to manufacture pure ATP.

1946 – Sigma was formed from Midwest Consultants and manufactured just adenosine triphosphate.

1935 – Midwest Consultants was founded in St Louis by brothers Aaron and Bernard Fischer, who hired chemical engineer Daniel Broida.The company grew throughout the 1980s and 1990s, with significant expansion in facilities, acquisitions and diversification into new market sectors.

Louis and Aldrich Chemical Company of Milwaukee were both American specialty chemical companies when they merged in August 1975.

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